Resolving Oracle problem “… error while loading shared libraries … libnnz11.so in Linux”

Follow the suggestion below if you encounter this issue with Oracle 11g in Linux environment:
/u01/app/oracle/product/11.1.0/bin/sqlplus: error while loading shared libraries: /u01/app/oracle/product/11.1.0/lib/libnnz11.so: cannot restore segment prot after reloc: Permission denied